Details

To improve useability/efficiency I would like to propose the following changes/additions to the layer list:

1) Combining the show and hide button into one button.

Clicking once will hide all layers, clicking again will show them all again.

2) A “lock/unlock” button.

Clicking once will lock all layers, clicking again will unlock them all again.

Regarding the icons I suggest that instead of show both the black and grey version of the eye/lock, you could switch between them depending on the state the switch-button is in. Also the mouse-over-text could/should change with the state.